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In the set 9, 10, 11, 12, all the numbers are solutions of 18 + 2x ≥ 36.
Substitute each number into the inequality:
1. 18 + 2(9) ≥ 36
18 + 18 ≥ 36
36 ≥ 36 (True)
2. 18 + 2(10) ≥ 36
18 + 20 ≥ 36
38 ≥ 36 (True)
3. 18 + 2(11) ≥ 36
18 + 22 ≥ 36
40 ≥ 36 (True)
4. 18 + 2(12) ≥ 36
18 + 24 ≥ 36
42 ≥ 36 (True)
Therefore, the set 9, 10, 11, 12 only contains numbers that satisfy the given inequality.